Helo Aero Hazards to flight 2

1 . If the pilot feels a side-to-side low frequency vibration the most likely cause is:

A main rotor blade is out of phase.

3 . High-frequency vibrations are typical to helicopter operations. An imbalance at a high frequency can be difficult to detect. How do you detect an imbalance in the high frequency vibrations?

A tracking and balancing system such as HUMS (if installed) otherwise it is difficult.

8 . Quick action must be taken by the pilot if the antitorque system fails, during hovering. The throttle should be closed immediately to:

Eliminate the turning motion.

2 . Medium-frequency vibrations are felt through the entire airframe, and prolonged exposure to the vibrations will cause what side effect?

Greater pilot fatigue.

5 . The type of chart which determines what altitudes and airspeeds are required to safely make an autorotative landing, in case of an engine failure, is known as the:

Height/Velocity Curve.

7 . Failure of the anti-torque system in most helicopters requires an autorotation, but the techniques differ depending on whether the helicopter is in flight or in a hover. What is recommended for most helicopters in forward flight?

Reduce collective enough to counteract yaw and roll off the throttle.

4 . Which of the following should not be done to transition from powered flight to autorotation?

Use the antitorque pedals to make turns.

6 . If a helicopter with a counter-clockwise rotating main rotor experiences a failure of the antitorque system at high power and low air speed, what will be the resulting reaction?

Yaw to the right.